Device for hammering piston rings



H. KISTNER.

DEVICE FoR HAMMERING PlsToN RINGS.

APPLICATION FILED MAY Il.v 1920.

PatentedNov. 14, 1922.

2 SHEETS-SHEET l.

Illll l H. KISTNER.l

DEVICE Fox HAMMERING PlsToN RINGS.

APPLICATION FILED MAY Il, |920.

1,435,481. PatentedNv.14,1922-.

2 SHEETS-SHEE'I 2.

Snom/nto@ Patented Nov.. 14, 1922.

ir s

HERMAN KISTNER, OF ELIZABETH, NEW JERSEY, ASSIGNOR T VICTORY HAMMERED PISTON RNG COMPANY, OF NEWARK, NEW JERSEY, A CORPORATION OF NEW JERSEY.

Application led May 11,

To all 'whom t may concern.:

Be it known that I, HERMAN KIs'rNER, a citizen of the United States, residing in the city of Elizabeth, in the county of Union and State of New Jersey, have invented certain new and useful Improvements in Devices for Hammering Piston Rings, of which the following is a specification.

The principal object of this invention is to provide a mechanism'and process for producing truly round concentric piston, rings,

highly elastic, compression proof, and of high tension, imparted by the peculiar and novel hammer treatment accorded them and by which the metal is toughened and strengthened by compression, rather than weakened by expansion as are rings made in the ordinary manner.

A further object is to provide a mechanism that will tension the ring by hammering upon both sides simultaneously, producing the desired pfeening effect in a rapid and eifective manner under any .pressure which may be desired. These and other objects, which will become apparent as the description progresses, are attained by the novel construction, combination and arrangement of parts hereinafter described and shown in the accompanying drawings, forming a material part of this disclosure, and in which Figure 1 is a side elevational view of a punch and vertical sectional view of a die in which the percussion hammer operations are performed.

Figure 2 is a plan view of the die.

Figure 3 is a perspective view of a piston ring, showing the peening marks and illustrating the peculiar manner in which they 40 are arranged.

Figure 4 is an enlarged cross sectional view taken on line 4*4 of Figure 3.

Referring to the drawings in detail, the numeral 10 designates in general a piston 45 ring, which, as shown in Figs. 3 and 4, is of uniform cross section throughout except at the overlapping ends 11, at the opening.

The lateral edges of the ring present flat parallel outer portions 12 and equal bevelled inner portions 14, formed at an angle of approximately forty-five degrees with the inner surface 15, which is concentric with the exterior surface of the ring.

The bevelled surfaces 14 have in them a plurality of radial indentations 17, of sub- DEVICE FOE'HAMMERING PISTON RINGS.

1920. Serial No. 380,500.

tively close together at a point opposite the ring opening, the indentations becoming spaced progressively further apart on each side to a` point at the center of the ring, from whence they are omitted to the ends 11; thus half of the ring is stressed by condensing the metal, due to the peening or percusslve effects vof hammer strokes, and the remainder,adjacent the opening, left 'in its natural condition.

The mechanismfor producing these effects, and which is the subject matter of the invention, will now be described.

Use is made of a powerful press, (not shown) comprising in combination with other operative parts a platen or work receiving element and a quick operating plunger or ram arranged perpendicularly with respect to the platen.

Attached to the platen is a die holder 20 of the usual type, containing a circular recess 21, having a central depression 22 in which is seated a die 23, held by the screws 24, passing up through the bottom of the die holder. The upper marginal edge -25 of the die is bevelled and on the bevelled surface are ridges 26 adapted to produce the aforesaid indentations, it being understood that the bevel 25 corresponds to that of the ring.

Circumjacent the die 23 is a thin cylindrical stripper 28, the thickness of its wall being equivalent to the flat side portion 12 of the ring, the stripper having an outturned flange 29 at its bottom resting upon a plurality of coiled compression springs 30, set in appropriate openings in the die block, and supported by screws 31, these sprin s maintaining the stripper in a normally raised position.

The upper side of the ilange 29 abuts, when raised, against a ring 32 formed with an annular block 33 fitted to the recess 21I and held firmly therein by the screws 34 passing up through the die holder. Disposed over the block 33 is a guide ring 35 the opening 36 of which is adapted to receive the piston ring 10 when closed, the upper part of the ring 35 being bevelled outwardly, as at 37, to permit the rings to be conveniently entered.

Entering the annular recess 38 in the the corresponding portion 39 of a clamp ring' 40,. held-bythe screws 4l to the to anisin described is the preferred embodiofthe dre block, with which it correspon s ment of the invention, it is not desired to in outer'diameter.

prised of a cylindrical body 45 havingeJ involvingthe exercise of invention, may be stem 46 enga cable by the usual means 1n made 'without departing :from the scope and the plunger o the press, the circular punch spirit of the appended claims.

' 48', which is an exact counterpart of the die.

extremity of the pilot 'being bevelledv .or g

rounded so as to readily enter into the corprising. a die block, a circular die secured` of the die 28.

. Having thus described my invention, 23, having a bevelled edge 49 and raised what ll claim as new and desire to secure by ridges 50 is held to the body bythe screws Letters Patent, is:- v 47 as shown. 'l v An apparatus vfor peening rings, com- A central circular opening 52 having a prising upper and lower elements having counterbore 53 is formed in the punch, the\ridged facing surfaces, the upper element same containing a pilot or guide stem 54 being movable to and from thelower eleprojecting outward below the punch, and ment, a guide for locatingthe rings, and a held by its enlarged head 55, set in thev counspring actuated stripper circumjacent said terbore 53 and backed byv awasher 56, the lower element.

2. An apparatus for peening rings comresponding guide opening 57 in the center therein, said die having a bevelled margin, narrow radial raised elements disposed in In operation, the punch and die having progressively spaced relation on the bevy restrict the exact details of construction, it The punch or hammer element is conl being obvious that :minor variations, not

been assembled and aligned in the press, the elled margin, a punch having its edge l ring to be peened is closed and entered in 4formed as a counterpart for said die, means the guide ring 35 until it rests upon the forguiding said punch relative to the die, a

upper edge of the stripper 28. gui for the rings and 'spring actuated The press is then caused to operate, movmeans for ejecting the rings after impressing the punch 48 down, the pilot 54. entering ing. the opening 57 thereby assuring'correct reg- 3. An apparatus for hammering rings istration, and continuing downward, decomprising oppositely disposed members, presses the ring and stripper until the ring each having raised radial ridges on their contacts with the die, whereupon the piinch bevelled edges whereby indentations are and die simultaneously operate to produce formed on each side of the rings simultathe desired corrugations'. l neously and means for actuating one of said As the punch rises, obviously the stripper, members relative to the other. due to its spring supports, releases the ring rlhis specification signed and witnessed from the die so that it can be easily removed. this 30th day of April, 1920.

From the foregoing` it will be seen that HERMAN KlS'lNER.

a simple but highly eHective apparatus has Witnesses: been disclosed -whlch can be conveniently FRnlTaK C. Fiscma, F. oLL. y f

and quickly operated, and while the mech- 

